Research examining pubertal timing effects on psychopathology has emphasized that a subset of adolescents, particularly females, who experience early pubertal maturation relative to their peers appear to be at increased risk for psychopathology. The aims of the current meta-analysis were (a) to quantify the magnitude of early pubertal timing effects on psychopathology, (b) to examine potential moderators of pubertal timing effects (sex, psychopathology domain, sample composition, measurement method, and mean sample age), and (c) to examine findings in relation to hypotheses in the extant literature explicating differential pubertal timing effects for early versus late youth and males versus females. A systematic literature search was conducted in PubMed and PsycINFO databases and 101 articles met criteria for inclusion. Included studies reported a quantitative association between pubertal timing and higher-order broadband dimensions of psychopathology (i.e., internalizing, externalizing), and/or lower-order subdomains (i.e., distress, fear, antisocial behavior, substance abuse, eating pathology). Using meta-analytic methods, we estimated global effect sizes (Cohen's ds) for the association between pubertal timing and psychopathology. Adolescent sex did not moderate early pubertal timing effects on emotional and behavior problems. However, robust early pubertal timing effects emerged for both males and females across all domains of psychopathology that were small in magnitude (ds∼.20). Measurement method of pubertal timing, but not sample composition or mean sample age, significantly contributed to the heterogeneity of effect sizes across studies. Findings have implications for refinement of theoretical models of pubertal timing effects on psychopathology and highlight the importance of empirical work that can identify pathways which may link offset pubertal timing to psychopathology during adolescence. (PsycINFO Database Record

Adults with attention-deficit/hyperactivity disorder (ADHD) exhibit variable impairments on executive function (EF) tasks. Due to this variability, ratings of EF (rather than tasks) have been proposed as an alternative method that better captures symptom severity and impairment among adults with ADHD. However, few studies have jointly examined performance across multiple neuropsychological domains and EF ratings as predictors of severity and impairment among adults with ADHD. Adults (N = 273) ages 18-38 years (M = 22.6 years, 55.3% male, 62.2% with ADHD) completed a comprehensive diagnostic and neurocognitive assessment, which included self and informant ratings of ADHD symptom severity and EF and tasks of arousal/activation, response inhibition, set shifting, interference control, and working memory. Hierarchical linear regression models indicated that tasks of arousal/activation and response inhibition uniquely predicted ADHD symptom dimensions and related impairments. Over and above EF task performance, EF ratings of time management significantly predicted increased inattention (β = .209, p < .001, ΔR² = 3.9%), whereas ratings of restraint predicted increased hyperactivity/impulsivity (β = .259, p < .001, ΔR² = 6.4%). Furthermore, EF ratings of time management, restraint, and emotion regulation incrementally accounted for variance in relationship, professional, and daily living impairments over and above EF task performance (ΔR² range = 1.7-7.7%). Results may help refine neurobiological theories and assessment of adult ADHD.

Ineffective parenting practices may maintain or exacerbate attention deficit/hyperactivity disorder (ADHD) symptoms and shape subsequent development of disruptive behavior disorders (DBD’s) in youth with ADHD. Recent theoretical models have suggested that parenting may exert effects on ADHD via its role in child temperament. The current study aimed to evaluate the indirect effects of parenting dimensions on child ADHD symptoms via child temperament. Youth ages 6–17 years (N=498; 50.4 % ADHD, 55 % male) completed a multi-stage, multi-informant assessment that included parent, child, and teacher report measures of parenting practices, child temperament, and ADHD symptoms. Statistical models examined the direct and indirect effects of maternal and paternal involvement, poor supervision, and inconsistent discipline on inattention and hyperactivity-impulsivity via child temperament and personality traits. Results indicated differential patterns of effect for negative and positive parenting dimensions. First, inconsistent discipline exerted indirect effects on both ADHD symptom dimensions via child conscientiousness, such that higher levels of inconsistency predicted lower levels of conscientiousness, which in turn, predicted greater ADHD symptomatology. Similarly, poor supervision also exerted indirect effects on inattention via child conscientiousness as well as significant indirect effects on hyperactivity-impulsivity via its impact on both child reactive control and conscientiousness. In contrast, primarily direct effects of positive parenting (i.e., involvement) on ADHD emerged. Secondary checks revealed that similar pathways may also emerge for comorbid disruptive behavior disorders. Current findings extend upon past work by examining how parenting practices influence child ADHD via within child mechanisms and provide support for multi-pathway models accounting for heterogeneity in the disorder.

Low birth weight (LBW) has consistently been associated with childhood attention- deficit hyperactivity disorder (ADHD), and a similar association has been found for childhood externalizing disorders, such as oppositional defiant disorder (ODD) and conduct disorder (CD), albeit to a lesser degree. Although the association between LBW and these disorders has been robustly replicated, few studies have adequately controlled for confounding variables, such as parental age at birth and prenatal tobacco use, examined the specificity of the risk of LBW for ADHD symptoms, or investigated potential nonlinear (i.e., quadratic) effects of birth weight. Additionally, the extent to which LBW confers risk for these disorders depending on childhood sex has rarely been examined. The current study examined associations between birth weight and ADHD, ODD, and CD symptom dimensions as well as the extent to which such associations are moderated by child sex, while also controlling for confounding variables. Significant interactions between sex and birth weight emerged across all analyses predicting ADHD and externalizing psychopathology, such that associations were stronger in males relative to females. Results remained when controlling for a number of confounds, including parental age, prenatal tobacco use, comorbid psychopathology, as well as other indicators of maternal and child health during the pre- and perinatal period. Both linear and quadratic associations emerged between birth weight and both hyperactivity and CD symptoms, whereas birth weight predicted inattention and ODD symptoms in a linear fashion. Future research should continue to investigate the impact of birth weight on ADHD and externalizing psychopathology, in particular the biological mechanisms underlying this association.

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